asp.net – 带有自定义数据的web api帖子图片

发布时间：2020-12-16 09:54:25 所属栏目：asp.Net 来源：网络整理

导读：我试图将一些带图像的自定义数据发布到web api.请看下面的方法. public void Post(FlyerDetails FlyerDetails) { var httpRequest = HttpContext.Current.Request; if (httpRequest.Files.Count 0) { foreach (string file in httpRequest.Files) { var file

我试图将一些带图像的自定义数据发布到web api.请看下面的方法.

public void Post(FlyerDetails FlyerDetails)
    {
        var httpRequest = HttpContext.Current.Request;
        if (httpRequest.Files.Count > 0)
        {
            foreach (string file in httpRequest.Files)
            {
                var filePath = HttpContext.Current.Server.MapPath("~/Flyers/" + httpRequest.Files[file].FileName);
                Bitmap bmp = new Bitmap(httpRequest.Files[file].InputStream);
                Graphics g = Graphics.FromImage(bmp);
                g.SmoothingMode = SmoothingMode.AntiAlias;
                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                g.PixelOffsetMode = PixelOffsetMode.HighQuality;
                g.DrawString(FlyerDetails.Message,new Font(FlyerDetails.FontColor,FlyerDetails.FontSize),Brushes.DarkRed,new PointF(0,0));
                g.Flush();
                bmp.Save(filePath);
            }
        }
    }

现在的问题是,当我使用参数保留此方法并从fiddler发布数据时,它显示415不支持的媒体类型错误.如果我删除参数,那么它工作正常.但我真的需要将数据与发布的图像一起传递.

任何人都可以建议一个很好的方法来实现这一目标

谢谢

解决方法

经过大量搜索后,我想出了将数据与图像一起上传的方法.这是代码的修订版本.希望它对某人有帮助.

public async Task<HttpResponseMessage> Post()
    {

        var streamProvider = new MultipartFormDataStreamProvider(HttpContext.Current.Server.MapPath("~/Flyers/"));
        await Request.Content.ReadAsMultipartAsync(streamProvider);

        var response = Request.CreateResponse(HttpStatusCode.Created);
        var filePath = "";// file path
        if (System.IO.File.Exists(filePath))
        {
            string extension = Path.GetExtension(filePath);
            Bitmap bmp = new Bitmap(filePath);
            Graphics g = Graphics.FromImage(bmp);
            g.SmoothingMode = SmoothingMode.AntiAlias;
            g.InterpolationMode = InterpolationMode.HighQualityBicubic;
            g.PixelOffsetMode = PixelOffsetMode.HighQuality;
            Color brushColor = System.Drawing.ColorTranslator.FromHtml(streamProvider.FormData["FontColorCode"]);
            g.DrawString(streamProvider.FormData["FontFamily"],new Font(brushColor.Name,Convert.ToInt32(streamProvider.FormData["FontSize"])),new SolidBrush(brushColor),0));
            g.Flush();
            bmp.Save(HttpContext.Current.Server.MapPath("~/" + Guid.NewGuid() + extension));
            response.Headers.Location = new Uri(new Uri(HttpContext.Current.Request.Url.AbsoluteUri).GetLeftPart(UriPartial.Authority) + "/Flyers/" + Guid.NewGuid() + extension);
        }
        return response;
    }

注意：应该将数据发布为mutipart-formdata.

（编辑：李大同）

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